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Journal articles on the topic 'Anisotropy'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hagiwara, Teruhiko. "Apparent dip and apparent anisotropy from multifrequency triaxial induction measurements." GEOPHYSICS 76, no. 1 (2011): F1—F13. http://dx.doi.org/10.1190/1.3511349.

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The triaxial (or multicomponent) induction log is used to measure not only the resistivity anisotropy of an anisotropic formation but also the relative dip of the tool with respect to the formation. The anisotropic resistivity and the relative dip of layered formations are also inverted from the triaxial induction-log measurements at a depth by assuming a homogeneous anisotropic formation or at multiple depths by assuming a multilayered formation model. When the triaxial induction log is run at multiple frequencies, multifrequency focusing can be applied to the log measurements. Then, the appa

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2

Thomsen, Leon. "Weak elastic anisotropy." GEOPHYSICS 51, no. 10 (1986): 1954–66. http://dx.doi.org/10.1190/1.1442051.

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Most bulk elastic media are weakly anisotropic. The equations governing weak anisotropy are much simpler than those governing strong anisotropy, and they are much easier to grasp intuitively. These equations indicate that a certain anisotropic parameter (denoted δ) controls most anisotropic phenomena of importance in exploration geophysics, some of which are nonnegligible even when the anisotropy is weak. The critical parameter δ is an awkward combination of elastic parameters, a combination which is totally independent of horizontal velocity and which may be either positive or negative in nat

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3

Wu, Feng Min, and Yuh Zhang Fang. "Anisotropic Growth of Metal Chains on Anisotropic Substrate." Solid State Phenomena 121-123 (March 2007): 1129–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.1129.

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Based on the exchange mechanism of metal islands growth on anisotropic metal surfaces, the growth processes of anisotropic Cu islands on the anisotropic Pd (110) surface are investigated by Monte Carlo simulations with realistic growth model and physical parameters. The anisotropic diffusion and anisotropic sticking of Cu adatoms are included in the simulation model after being considered the anisotropy of Pd (110) surface and compared to the experiments. It is found that the larger diffusion rate along the [110] channels of Pd (110) surface gives rise to a slower growth rate of Cu island in t

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4

Zhu, H., and L. M. Zhang. "Characterizing geotechnical anisotropic spatial variations using random field theory." Canadian Geotechnical Journal 50, no. 7 (2013): 723–34. http://dx.doi.org/10.1139/cgj-2012-0345.

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In this study, anisotropic heterogeneous geotechnical fields are characterized using random field theory, in which five basic patterns of material anisotropy are simulated including isotropy, transverse anisotropy, rotated anisotropy, general anisotropy, and general rotated anisotropy. Theoretical formulations of scale of fluctuation as a function of directional angle are developed for the five basic patterns of anisotropy through modifications of the coordinate system. These formulations of scale of fluctuation are identical for different correlation structures. Correlation functions for the

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5

Luo, Tianya, Xiangyun Hu, Longwei Chen, and Guilin Xu. "Investigating the Magnetotelluric Responses in Electrical Anisotropic Media." Remote Sensing 14, no. 10 (2022): 2328. http://dx.doi.org/10.3390/rs14102328.

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When interpreting magnetotelluric (MT) data, because of the inherent anisotropy of the earth, considering electrical anisotropy is crucial. Accordingly, using the edge-based finite element method, we calculated the responses of MT data for electrical isotropic and anisotropic models, and subsequently used the anisotropy index and polar plot to depict MT responses. High values of the anisotropy index were mainly yielded at the boundary domains of anomalous bodies for isotropy cases because the conductive differences among isotropic anomalous bodies or among anomalous bodies and background earth

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6

Secco, R. A., and P. S. Balog. "On the possibility of anisotropic heat flow in the inner core." Canadian Journal of Earth Sciences 38, no. 6 (2001): 975–82. http://dx.doi.org/10.1139/e00-116.

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We consider the possibility of anisotropic heat flow in the inner core by examining the potential for anisotropic thermal conductivity of hexagonal close-packed (hcp-)Fe. Because hcp-Fe exists only at pressures above 13 GPa at room temperature, we investigate thermal conductivity anisotropy in analog material Gd by measuring the electrical conductivity and applying the WiedemannFranz Law to determine thermal conductivity (k). The electrical conductivity anisotropy of Gd was measured at pressures up to 1.4 GPa and temperatures up to 873 K in the hcp phase range. At elevated pressure, the varia

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7

Vladimirov, Ivaylo N., and Stefanie Reese. "Prediction of Springback in Unconstrained Bending by a Model for Evolving Elastic and Plastic Anisotropy." Key Engineering Materials 554-557 (June 2013): 2330–37. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.2330.

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Sheet metals exhibit anisotropic plastic behavior due to the large plastic deformations that occur during the rolling of the sheet and which induce texture and are responsible for the initial anisotropy. There exist various possibilities to introduce plastic anisotropy into the finite element modelling of sheet metal forming. The initial yield anisotropy can be incorporated either through an anisotropic yield surface or directly by means of a crystallographic texture model. Here, one basically differentiates between empirical and phenomenological anisotropic yield function equations, where the

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8

Zhang, Chao, Xiangzhuang Kong, Xian Wang, Yanxia Du, and Guangming Xiao. "A Predicting Model for the Effective Thermal Conductivity of Anisotropic Open-Cell Foam." Energies 15, no. 16 (2022): 6091. http://dx.doi.org/10.3390/en15166091.

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The structural anisotropy of open-cell foam leads to the anisotropy of effective thermal conductivity (ETC). To quantitatively analyze the effect of structural anisotropy on the anisotropy of ETC, a new predicting model for the ETC of anisotropic open-cell foam was proposed based on an anisotropy tetrakaidecahedron cell (ATC). Feret diameters in three orthogonal directions obtained by morphological analysis of real foam structures were used to characterize the anisotropy of ATC. To validate our proposed anisotropic model, the ETCs of real foam structures in three orthogonal directions predicte

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9

Edwin, Privita Edwina Rayappan George, Sumeet Kumar, Srestha Roy, Basudev Roy, and Saumendra Kumar Bajpai. "Anisotropic 3D confinement of MCF-7 cells induces directed cell-migration and viscoelastic anisotropy of cell-membrane." Physical Biology 20, no. 1 (2022): 016003. http://dx.doi.org/10.1088/1478-3975/ac9bc1.

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Abstract Tumor-associated collagen signature-3 (TACS-3) is a prognostic indicator for breast cancer survival. It is characterized by highly organized, parallel bundles of collagen fibers oriented perpendicular to the tumor boundary, serving as directional, confining channels for cancer cell invasion. Here we design a TACS-3-mimetic anisotropic, confined collagen I matrix and examine the relation between anisotropy of matrix, directed cellular migration, and anisotropy of cell membrane-the first direct contact between TACS-3 and cell-using Michigan Cancer Foundation-7 (MCF-7) cells as cancer-mo

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10

ACHARYYA, MUKTISH. "AXIAL AND OFF-AXIAL DYNAMIC TRANSITIONS IN UNIAXIALLY ANISOTROPIC HEISENBERG FERROMAGNET: A COMPARISON." International Journal of Modern Physics C 14, no. 01 (2003): 49–59. http://dx.doi.org/10.1142/s0129183103004206.

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Uniaxially anisotropic Heisenberg ferromagnet, in the presence of a magnetic field varying sinusoidally in time, is studied by Monte Carlo simulation. The axial (field applied only along the direction of anisotropy) and off-axial (field applied only along the direction which is perpendicular to the direction of anisotropy) dynamic transitions are studied. By studying the distribution of the dynamic order parameter component, it is observed that the axial transition is discontinuous for low anisotropy and becomes continuous in high anisotropy. The off-axial transition is found to be continuous

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11

Hagiwara, Teruhiko. "Determination of dip and anisotropy from transient triaxial induction measurements." GEOPHYSICS 77, no. 4 (2012): D105—D112. http://dx.doi.org/10.1190/geo2011-0503.1.

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The dip and anisotropy of an anisotropic formation were algebraically determined from the transient triaxial induction data without inversion. The time-dependent apparent dip and the apparent anisotropy, algebraically defined from the triaxial transient induction measurements, were applied in a two-layer formation. The apparent dip yielded the true dip in an anisotropic formation, as well as in layered formations, though it yielded the zero dip in an isotropic formation. At early time the apparent anisotropy yielded the true anisotropy of the layer on which the induction tool was located, and

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12

Martins, Jorge L. "Elastic impedance in weakly anisotropic media." GEOPHYSICS 71, no. 3 (2006): D73—D83. http://dx.doi.org/10.1190/1.2195448.

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The original formulation for the P-wave elastic impedance (EI) equation ignores seismic anisotropy. Incorporation of anisotropy effects into the EI formula requires a suitable approximation for reflection coefficients. In order to derive an anisotropic EI equation, this paper uses an approximation for PP-wave reflection [Formula: see text] coefficients which holds for weak-contrast interfaces separating weakly anisotropic media of arbitrary symmetry. Inserting the chosen [Formula: see text] coefficient approximation into the original formalism provides an anisotropic EI formula, which is writt

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13

OTÁLORA, FERMÍN, and JUANMA GARCÍA-RUIZ. "THE ANISOTROPY OF ON-LATTICE SIMULATIONS OF AGGREGATE GROWTH." Fractals 01, no. 04 (1993): 867–74. http://dx.doi.org/10.1142/s0218348x93000897.

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The origin of anisotropy in on-lattice simulations of cluster growth is investigated by quantifying the anisotropic behavior of the two processes involved in the simulation: transport and aggregation of nutrient particles. Three different anisotropic effects are described: anisotropic surface kinetics, anisotropic concentration profiles and anisotropic screening. The relevance of these sources of anisotropy in natural systems is discussed.

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14

Gurevich, Boris, Marina Pervukhina, and Dina Makarynska. "An analytic model for the stress-induced anisotropy of dry rocks." GEOPHYSICS 76, no. 3 (2011): WA125—WA133. http://dx.doi.org/10.1190/1.3567950.

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One of the main causes of azimuthal anisotropy in sedimentary rocks is anisotropy of tectonic stresses in the earth’s crust. We have developed an analytic model for seismic anisotropy caused by the application of a small anisotropic stress. We first considered an isotropic linearly elastic medium (porous or nonporous) permeated by a distribution of discontinuities with random (isotropic) orientation (such as randomly oriented compliant grain contacts or cracks). The geometry of individual discontinuities is not specified. Instead, their behavior is defined by a ratio B of the normal to tangent

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15

KIM, C. S., and MIN-HO LEE. "RANDOM WALK ON ANISOTROPICALLY GENERATED PERCOLATION CLUSTER AND ANISOTROPIC RANDOM WALK ON PERCOLATION CLUSTER." Modern Physics Letters B 03, no. 10 (1989): 765–70. http://dx.doi.org/10.1142/s0217984989001205.

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We studied two subjects related to anisotropy: random walk on percolation cluster having anisotropy (RWAC) and direction dependent (anisotropic) random walk on percolation cluster (AWIC). We find that the anisotropy of the cluster has only time-delaying effect on asymptotic convergence of the spectral dimensionality ds and fractal dimensionality of walk dw, however, the anisotropy of the walk results in lower spectral dimensionality and higher fractal dimensionality, as anisotropy grows larger.

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16

Pedruelo-González, Luis M., and Juan L. Fernández-Martínez. "Generalization of Snell's Law for the propagation of acoustic waves in elliptically anisotropic media." AIMS Mathematics 9, no. 6 (2024): 14997–5007. http://dx.doi.org/10.3934/math.2024726.

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<abstract> <p>In seismic data processing, both in inversion (Inverse Processing) and modeling (Direct Processing), it is essential to consider anisotropy to unravel the geological structure of the subsoil. Besides, in most cases, the macroscopic model of anisotropy in 2D seismic surveys is elliptical and weak, with ratios of anisotropy close to one. Therefore, it is crucial to have at disposal the analytical formulas for acoustic wave propagation in elliptical anisotropic media. We presented the generalization of the Snell's Law for the case of acoustic wave propagation in elliptic

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17

VanderBeek, Brandon P., and Manuele Faccenda. "Imaging upper mantle anisotropy with teleseismic P-wave delays: insights from tomographic reconstructions of subduction simulations." Geophysical Journal International 225, no. 3 (2021): 2097–119. http://dx.doi.org/10.1093/gji/ggab081.

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SUMMARY Despite the well-established anisotropic nature of Earth’s upper mantle, the influence of elastic anisotropy on teleseismic P-wave imaging remains largely ignored. Unmodelled anisotropic heterogeneity can lead to substantial isotropic velocity artefacts that may be misinterpreted as compositional heterogeneities. Recent studies have demonstrated the possibility of inverting P-wave delay times for the strength and orientation of seismic anisotropy. However, the ability of P-wave delay times to constrain complex anisotropic patterns, such as those expected in subduction settings, remains

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18

Han, Han. "Influence of Material Anisotropy and Friction on Ring Deformation." Journal of Tribology 124, no. 3 (2002): 637–44. http://dx.doi.org/10.1115/1.1473144.

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The influence of material anisotropy and friction on ring deformation has been examined in relation to the distribution of normal pressure and frictional shear stress, deformed ring shapes, and estimated errors in the coefficient of friction. Based on the flow rule associated with von Mises’ and Hill’s yield criteria, the analyses have been carried out with the finite element method (FEM) for three cases, namely, (1) an anisotropic ring oriented 90 deg to the axis of rotational symmetrical anisotropy under uniform coefficient of friction; (2) an isotropic ring under frictional anisotropy condi

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19

Mohanty, Sailesh Ranjan, Sayantan Ghosh, Pinku Routaray, H. C. Das та Bharat Kumar. "The impact of anisotropy on neutron star properties: insights from 𝖨–𝖿–𝖢 universal relations". Journal of Cosmology and Astroparticle Physics 2024, № 03 (2024): 054. http://dx.doi.org/10.1088/1475-7516/2024/03/054.

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Abstract Anisotropy in pressure within a star emerges from exotic internal processes. In this study, we incorporate pressure anisotropy using the Quasi-Local model. Macroscopic properties, including mass (M), radius (R), compactness (C), dimensionless tidal deformability (Λ), the moment of inertia (I), and oscillation frequency (f), are explored for the anisotropic neutron star. Magnitudes of these properties are notably influenced by anisotropy degree. Universal I–f–C relations for anisotropic stars are explored in this study. The analysis encompasses various EOS types, spanning from relativi

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20

Zhang, Xiangxiang, J. G. Wang, Xiaolin Wang, and Feng Gao. "Numerical Simulations on the Front Motion of Water Permeation into Anisotropic Porous Media." Geofluids 2019 (March 4, 2019): 1–13. http://dx.doi.org/10.1155/2019/7692490.

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Water permeation into a porous medium is a common but important phenomenon in many engineering fields such as hydraulic fracturing. The water permeation front moves with time and may significantly impact the field variable evolution near the water front. Many algorithms have been developed to calculate this water front motion, but few numerical algorithms have been available to calculate the water front motion in anisotropic fluid-solid couplings with high computational efficiency. In this study, a numerical model is proposed to investigate the front motion of water permeation into an anisotro

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21

Wijesinghe, Dilmini, and Bradley J. Roth. "Indentation of Anisotropic Tissue Using a Three-Dimensional Mechanical Bidomain Model." Fibers 10, no. 8 (2022): 69. http://dx.doi.org/10.3390/fib10080069.

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Computation-based mathematical models of tissue indentation are capable of predicting the distribution of forces and mechanical properties of soft tissues. This paper presents a three-dimensional mathematical model of anisotropic tissue indentation developed using the mechanical bidomain model. The mechanical bidomain model hypothesizes that the relative displacement between intra- and extracellular spaces triggers a force on the mechanosensitive proteins in the membrane: integrins. Some soft tissues, such as cardiac muscle, are anisotropic, a property which arises from the fibrous structure o

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22

Boitz, Nepomuk, Anton Reshetnikov, and Serge A. Shapiro. "Visualizing effects of anisotropy on seismic moments and their potency-tensor isotropic equivalent." GEOPHYSICS 83, no. 3 (2018): C85—C97. http://dx.doi.org/10.1190/geo2017-0442.1.

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Radiation patterns of earthquakes contain important information on tectonic strain responsible for seismic events. However, elastic anisotropy may significantly impact these patterns. We systematically investigate and visualize the effect of anisotropy on the radiation patterns of microseismic events. For visualization, we use a vertical-transverse-isotropic (VTI) medium. We distinguish between two different effects: the anisotropy in the source and the anisotropy on the propagation path. Source anisotropy mathematically comes from the matrix multiplication of the anisotropic stiffness tensor

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23

Thomsen, Leon. "Reflection seismology over azimuthally anisotropic media." GEOPHYSICS 53, no. 3 (1988): 304–13. http://dx.doi.org/10.1190/1.1442464.

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Recent surveys have shown that azimuthal anisotropy (due most plausibly to aligned fractures) has an important effect on seismic shear waves. Previous work had discussed these effects on VSP data; the same effects are seen in surface recording of reflections at small to moderate angles of incidence. The anisotropic effects on different polarization components of vertically traveling shear waves permit the recognition and estimation of very small degrees of azimuthal anisotropy (of order ⩾1 percent), as in an interferometer. Anisotropic effects on traveltime yield estimates of anisotropy which

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24

Grech, M. Graziella Kirtland, Don C. Lawton, and Samuel H. Gray. "A multioffset vertical seismic profiling experiment for anisotropy analysis and depth imaging." GEOPHYSICS 67, no. 2 (2002): 348–54. http://dx.doi.org/10.1190/1.1468595.

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A multioffset vertical seismic profile (VSP) was carried out in the Rocky Mountain foothills of southern Alberta, Canada. The purpose of this experiment was to investigate whether the dipping shale strata exhibit P‐wave velocity anisotropy and, if so, to calculate the Thomsen anisotropy parameters for use in anisotropic depth migration. Traveltime inversion of first‐arrival data from the multioffset VSP revealed that the dipping Mesozoic clastics in the area exhibit seismic velocity anisotropy of about 10%. The anisotropy parameters derived from this experiment were then used in anisotropic pr

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Guo, Songfeng, Shengwen Qi, Bowen Zheng, et al. "The Confinement-Affected Strength Variety of Anisotropic Rock Mass." Materials 15, no. 23 (2022): 8444. http://dx.doi.org/10.3390/ma15238444.

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It has been recognized that the anisotropic structures dominate the deformation and strength properties of laminated rock masses. The resultant strength anisotropy is strongly affected by confining pressures beyond anisotropic structures. Nevertheless, the effects of confinement are inconsistent among existing experiments and not fully understood. This study focuses on the effects of confining pressure on strength anisotropy through theoretical derivation together with experimental results analysis. The variations in the possibility of anisotropic structural plane dominant failure and strength

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26

JAIN, PANKAJ, MONINDER S. MODGIL, and JOHN P. RALSTON. "SEARCH FOR GLOBAL METRIC ANISOTROPY IN TYPE 1a SUPERNOVA DATA." Modern Physics Letters A 22, no. 16 (2007): 1153–65. http://dx.doi.org/10.1142/s0217732307023389.

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We examine the Type 1a supernova data in order to determine if it shows any signal of large scale anisotropy. The anisotropy is modelled by an extended Gödel metric, which incorporates expansion along with rotation. The model is smoothly connected to the usual FRW type, while expressing anisotropic metric effects depending on certain parameters. We find no significant signal of anisotropy in the data. We obtain bounds on an anisotropic redshift versus magnitude relationship, and accompanying parameters of the Gödel–Obukhov metric.

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27

Wei, Qiqi, Hailong Wang, Xupeng Zhao, and Jianhua Zhao. "Electron mobility anisotropy in (Al,Ga)Sb/InAs two-dimensional electron gases epitaxied on GaAs (001) substrates." Journal of Semiconductors 43, no. 7 (2022): 072101. http://dx.doi.org/10.1088/1674-4926/43/7/072101.

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Abstract The electron mobility anisotropy in (Al,Ga)Sb/InAs two-dimensional electron gases with different surface morphology has been investigated. Large electron mobility anisotropy is found for the sample with anisotropic morphology, which is mainly induced by the threading dislocations in the InAs layer. For the samples with isotropic morphology, the electron mobility is also anisotropic and could be attributed to the piezoelectric scattering. At low temperature (below transition temperature), the piezoelectric scattering is enhanced with the increase of temperature, leading to the increase

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28

Khudaiberdiev, D. A., M. L. Savchenko, D. A. Kozlov, N. N. Mikhailov, and Z. D. Kvon. "Scattering anisotropy in HgTe (013) quantum well." Applied Physics Letters 121, no. 8 (2022): 083101. http://dx.doi.org/10.1063/5.0101932.

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We report on a detailed experimental study of the electron transport anisotropy in HgTe (013) quantum well of 22 nm width in the directions [Formula: see text] and [Formula: see text] as the electron density function n. The anisotropy is absent at the minimal electron density near a charge neutrality point. The anisotropy increases with the increase in n and reaches about 10% when the Fermi level is within the first subband H1. There is a sharp increase in the anisotropy (up to 60%) when the Fermi level reaches the second subband E2. We conclude that the first effect is due to the small intra-

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29

Kolomiets, I. S. "Studying anisotropic properties of longitudinal inhomogeneous nondepolarizing media with elliptical phase anisotropy." Semiconductor Physics Quantum Electronics and Optoelectronics 16, no. 4 (2013): 366–73. http://dx.doi.org/10.15407/spqeo16.04.366.

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Liu, Yajun, Pritam Yogeshwar, Xiangyun Hu, et al. "Effects of electrical anisotropy on long-offset transient electromagnetic data." Geophysical Journal International 222, no. 2 (2020): 1074–89. http://dx.doi.org/10.1093/gji/ggaa213.

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SUMMARY Electrical anisotropy of formations has been long recognized by field and laboratory evidence. However, most interpretations of long-offset transient electromagnetic (LOTEM) data are based on the assumption of an electrical isotropic earth. Neglecting electrical anisotropy of formations may cause severe misleading interpretations in regions with strong electrical anisotropy. During a large scale LOTEM survey in a former mining area in Eastern Germany, data was acquired over black shale formations. These black shales are expected to produce a pronounced bulk anisotropy. Here, we investi

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31

Watson, Julian Matthew, Abouzar Vakili, and Mateusz Jakubowski. "Rock Strength Anisotropy in High Stress Conditions: A Case Study for Application to Shaft Stability Assessments." Studia Geotechnica et Mechanica 37, no. 1 (2015): 115–25. http://dx.doi.org/10.1515/sgem-2015-0013.

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Abstract Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength aniso

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Ren, Qi, and Kyle T. Spikes. "Modeling the effects of microscale fabric complexity on the anisotropy of the Eagle Ford Shale." Interpretation 4, no. 2 (2016): SE17—SE29. http://dx.doi.org/10.1190/int-2015-0120.1.

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Microscale fabric influences the elastic properties of rock formations. The complexity of the microscale fabric of shale results from composition, platy clay minerals, kerogen, and their preferred orientation patterns. This microscale fabric is also the likely cause of the elastic anisotropy of the rock. In this paper, we have developed a comprehensive three-step rock-physics approach to model the anisotropic elastic properties of the Upper Eagle Ford Shale. We started with anisotropic differential effective medium modeling, followed by an orientation correction, and then a pressure adjustment

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Zalizniak, Roman. "MODELING AND IMPROVEMENT OF ANISOTROPIC STRENGTHENING OF ORTHOTROPIC CRYSTALLINE MATERIALS." Vibrations in engineering and technology, no. 1 (108) (May 1, 2023): 99–103. http://dx.doi.org/10.37128/2306-8744-2023-1-11.

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Sheet material subject to stamping, as a rule, has an anisotropy of mechanical properties due to the brand of the material and the technological modes of its production. The anisotropy of the mechanical properties of the workpiece material can have both a positive and a negative effect on the steady course of technological processes of pressure metal processing. In the processes of plastic deformation, the initial anisotropy of the mechanical properties changes and depends on the processing modes. When analyzing the technological processes of processing anisotropic metals by pressure, the init

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Carrion, Philip, Jesse Costa, Jose E. Ferrer Pinheiro, and Michael Schoenberg. "Cross‐borehole tomography in anisotropic media." GEOPHYSICS 57, no. 9 (1992): 1194–98. http://dx.doi.org/10.1190/1.1443333.

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Anisotropy has significant effect on traveltime cross‐borehole tomography. Even relatively weak anisotropy cannot be ignored if accurate velocity estimates are desired, since isotropic traveltime tomography treats anisotropy as inhomogeneity. Traveltime data in our examples were synthetically generated by a ray‐tracing code for anisotropic media, and the computed quasi‐P‐wave traveltimes were subsequently inverted using the “dual tomography” technique (Carrion, 1991). The results of the tomographic inversion show typical artifacts due to the anisotropy, and that accurate imaging is impossible

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35

Gavin, Lisa J., and David Lumley. "Stress-induced seismic azimuthal anisotropy, sand-shale content, and depth trends offshore North West Australia." GEOPHYSICS 82, no. 2 (2017): C77—C90. http://dx.doi.org/10.1190/geo2015-0709.1.

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Seismic azimuthal anisotropy is apparent when P-wave velocities vary with source-receiver azimuth and downward-propagating S-waves split into two quasi-S-waves, polarized in orthogonal directions. Not accounting for these effects can degrade seismic image quality and result in erroneous amplitude analysis and geologic interpretations. There are currently no physical models available to describe how azimuthal anisotropy induced by differential horizontal stress varies with sand-shale lithology and depth; we develop a model that does so, in unconsolidated sand-shale sequences offshore North West

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Kan, V., V. F. Sofieva, and F. Dalaudier. "Variable anisotropy of small-scale stratospheric irregularities retrieved from stellar scintillation measurements by GOMOS/Envisat." Atmospheric Measurement Techniques 7, no. 6 (2014): 1861–72. http://dx.doi.org/10.5194/amt-7-1861-2014.

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Abstract. In this paper, we consider possibilities for studying the anisotropy of small-scale air density irregularities using satellite observations of bi-chromatic stellar scintillations during tangential occultations. Estimation of the anisotropy coefficient (the ratio of the characteristic horizontal to vertical scales) and other atmospheric parameters is based on the comparison of simulated/theoretical and experimental auto-spectra and coherency spectra of scintillation. Our analyses exploit a 3-D model of the spectrum of atmospheric inhomogeneities, which consists of anisotropic and isot

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Kan, V., V. F. Sofieva, and F. Dalaudier. "Variable anisotropy of small-scale stratospheric irregularities retrieved from stellar scintillation measurements by GOMOS/Envisat." Atmospheric Measurement Techniques Discussions 7, no. 2 (2014): 1275–304. http://dx.doi.org/10.5194/amtd-7-1275-2014.

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Abstract. In this paper, we consider possibilities for studying the anisotropy of small-scale air density irregularities using satellite observations of bi-chromatic stellar scintillations during tangential occultations. Estimation of the anisotropy coefficient (the ratio of the characteristic horizontal to vertical scales) and other atmospheric parameters is based on the comparison of simulated/theoretical and experimental auto-spectra and coherency spectra of scintillation. Our analyses exploit a 3-D model of the spectrum of atmospheric inhomogeneities, which consists of anisotropic and isot

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Parchinskiy, P. B., A. S. Gazizulina, A. A. Nasirov, and Sh U. Yuldashev. "Anisotropic magnetoresistance of GaMnAs:Be." Semiconductor Physics, Quantum Electronics and Optoelectronics 27, no. 03 (2024): 302–7. http://dx.doi.org/10.15407/spqeo27.03.302.

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The effect of co-doping with Be on the magnetic anisotropy in Ga0.972Mn0.028As epitaxial layers has been studied by magnetoresistance measurements. Co-doping with Be has been shown to lead to reorientation of both easy and hard magnetic axes in GaMnAs. Measurements of the temperature dependence of the anisotropic magnetoresistance demonstrate no changes in the type of the magnetic anisotropy with the increase in temperature. The results of the study of the anisotropic magnetoresistance indicate that the parameters of the magnetic anisotropy in GaMnAs are significantly influenced by the magnitu

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Pranowo, Waskito, and Sonny Winardhi. "Application of Velocity Variation with Angle (VVA) Method on an Anisotropic Model with Thomsen Delta Anisotropy Parameters." Jurnal Geofisika 16, no. 2 (2018): 6. http://dx.doi.org/10.36435/jgf.v16i2.371.

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Anisotropic properties will influence seismic propagation, for example it will affect wave velocity. One of well-known anisotropi equation for Transversaly Isotropic media is weak anisotropy with Thomsen's notation. Supriyono [2011] tried to estimate all of these variables by using velocity variation with angle (VVA) attribute. This research uses synthetic data, which is CMP Gather to know limitations of VVA attribute, to identify the error values, and to determine the best indicator of anisotropic eect. This research also uses another analysis method, which is grid search inversion to estimat

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Lubkov, M. V. "Application of the finite element-differences method for modeling of anisotropic filtration processes." Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, no. 3 (2021): 63–66. http://dx.doi.org/10.17721/1812-5409.2021/3.10.

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We consider modeling and geophysical interpretation of the obtained results in the oil and gas production problems in anisotropic reservoirs. For solving these practical problems, we use combined finite element-differences method of resolving anisotropic piezoconductivity problem with calculation of heterogeneous filtration parameters distribution of oil and gas productive reservoirs and oil-gas penetration conditions in the borders of investigating areas. We have defined that the anisotropy of oil and gas permeability in the far zone of the well has a greater effect on the filtration processe

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Gupta, Anand, Suman Panthee, and Dr Janani Selvam. "Relationship between UCS and Anisotropic Angle: A Case Study for Slate of Himalaya Region." International Journal of Innovative Technology and Exploring Engineering 14, no. 2 (2025): 21–24. https://doi.org/10.35940/ijitee.d4598.14020125.

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The strength of rocks exhibits anisotropy, because of its mode of formation and its developing through different pressure and temperature environment. A rock can display anisotropy due to inhomogeneity, where sedimentary varying with the degree of the anisotropic plane. This strength anisotropy" refers to the change in intact rock strength under uniaxial loading conditions based on the orientation of anisotropy, the strength and deformation behavior of rocks under load is critical for underground excavations, mining, and civil engineering projects, as it directly impacts the stability of such

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Zhu, Tieyuan. "Numerical simulation of seismic wave propagation in viscoelastic-anisotropic media using frequency-independent Q wave equation." GEOPHYSICS 82, no. 4 (2017): WA1—WA10. http://dx.doi.org/10.1190/geo2016-0635.1.

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Seismic anisotropy is the fundamental phenomenon of wave propagation in the earth’s interior. Numerical modeling of wave behavior is critical for exploration and global seismology studies. The full elastic (anisotropy) wave equation is often used to model the complexity of velocity anisotropy, but it ignores attenuation anisotropy. I have presented a time-domain displacement-stress formulation of the anisotropic-viscoelastic wave equation, which holds for arbitrarily anisotropic velocity and attenuation [Formula: see text]. The frequency-independent [Formula: see text] model is considered in t

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Kyriakides, S., and M. K. Yeh. "Plastic Anisotropy in Drawn Metal Tubes." Journal of Engineering for Industry 110, no. 3 (1988): 303–7. http://dx.doi.org/10.1115/1.3187886.

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A relatively simple experimental procedure for establishing the anisotropic yield characteristics of commercially available drawn metal tubes is described. Hill’s [4] extension of the Von Mises yield criterion to anisotropic yielding is used to describe the anisotropy present. Results from commercially available stainless steel are presented where the anisotropy is characterized by differences between the yield stresses in the circumferential and axial directions.

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Kong, Wenxin, Changhong Lin, Handong Tan, Miao Peng, Tuo Tong, and Mao Wang. "The Effects of 3D Electrical Anisotropy on Magnetotelluric Responses: Synthetic Case Studies." Journal of Environmental and Engineering Geophysics 23, no. 1 (2018): 61–75. http://dx.doi.org/10.2113/jeeg23.1.61.

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Using the staggered-grid finite difference method, a numerical modeling algorithm for a 3D arbitrary anisotropic Earth is implemented based on magnetotelluric (MT) theory. After the validation of this algorithm and comparison with predecessors, it was applied to several qualitative and quantitative analyses containing electrical anisotropy and a simple 3D prism model. It was found that anisotropic parameters for ρ 1 , ρ 2 , and ρ 3 play almost the same role in affecting 3D MT responses as in 1D and 2D without considering three Euler's angles α S , α D , and α L . Significant differences appear

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Sams, Mark, Annushia Annamalai, and Jeremy Gallop. "Seismic amplitude variation with offset inversion in a vertical transverse isotropy medium." Interpretation 7, no. 3 (2019): T581—T593. http://dx.doi.org/10.1190/int-2018-0137.1.

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Vertical transverse isotropy (VTI) will affect seismic inversion, but it is not possible to solve for the full set of anisotropic elastic parameters from amplitude variation with offset inversion because there exists an isotropic solution to every VTI problem. We can easily approximate the pseudoisotropic properties that result from the isotropic solution to the anisotropic problem for well-log data. We can then use these well-log properties to provide a low-frequency model for inversion and/or a framework for interpreting either absolute or relative inversion results. This, however, requires

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Hu, Yunyun, and Qingtao Sun. "Modeling of triaxial induction logging responses in multilayered anisotropic formations." GEOPHYSICS 86, no. 4 (2021): E305—E314. http://dx.doi.org/10.1190/geo2020-0475.1.

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Triaxial induction logging tools have been widely applied to formation characterization due to their sensitivity to electric anisotropy. To model triaxial induction logs in multilayered general anisotropic formations, where the anisotropy can be arbitrary, an analytical method is applied to compute the tool responses. For the analytical method, Maxwell’s equations in the spectral domain are written into a compact first-order differential equation. The equation is solved to obtain the spectral-domain fields, which are transformed to the spatial domain through the inverse Fourier transform. The

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Han, S.-M., and J.-Y. Rho. "Dependence of broadband ultrasound attenuation on the elastic anisotropy of trabecular bone." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 212, no. 3 (1998): 223–26. http://dx.doi.org/10.1243/0954411981534006.

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The effect of trabecular elastic anisotropy on broadband ultrasound attenuation (BUA) and bone mineral density (BMD) was investigated with human and bovine cubic cancellous bones. Ultrasonic parameters describing trabecular anisotropy were found from the three orthogonal ultrasound velocities. BMD was measured using quantitative computed tomography. Three elastic anisotropy ratios were compared to BUA in all three directions and to BMD. The combined effect of anisotropic characteristics and BMD was also correlated with BUA. The results showed that the anisotropy ratios were significantly relat

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Orazymbet, Ayazhan, Aray Muratkhan, Daniya Utepova, Nurzada Beissen, Gulzada Baimbetova, and Saken Toktarbay. "Numerical Solutions and Stability Analysis of White Dwarfs with a Generalized Anisotropic Factor." Galaxies 13, no. 3 (2025): 69. https://doi.org/10.3390/galaxies13030069.

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This study examines the equilibrium structure and stability of white dwarfs, incorporating both isotropic and anisotropic pressure distributions. The Tolman–Oppenheimer–Volkoff (TOV) equation is numerically solved using the Chandrasekhar equation of state (EoS) to analyze the effects of pressure anisotropy. A general anisotropy function is introduced to close and solve the system of differential equations. The results indicate that anisotropy remains negligible at the center and increases toward the stellar surface. Stability is assessed using the speed of sound criterion, vs2=dp/dρ, and the B

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Alkhalifah, Tariq. "Transformation to zero offset in transversely isotropic media." GEOPHYSICS 61, no. 4 (1996): 947–63. http://dx.doi.org/10.1190/1.1444044.

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Nearly all dip‐moveout correction (DMO) implementations to date assume isotropic homogeneous media. Usually, this has been acceptable considering the tremendous cost savings of homogeneous isotropic DMO and considering the difficulty of obtaining the anisotropy parameters required for effective implementation. In the presence of typical anisotropy, however, ignoring the anisotropy can yield inadequate results. Since anisotropy may introduce large deviations from hyperbolic moveout, accurate transformation to zero‐offset in anisotropic media should address such nonhyperbolic moveout behavior of

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Daghash, Shaden, Phillip Servio, and Alejandro Rey. "First-Principles Elastic and Anisotropic Characteristics of Structure-H Gas Hydrate under Pressure." Crystals 11, no. 5 (2021): 477. http://dx.doi.org/10.3390/cryst11050477.

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Evaluating gas hydrates properties contributes valuably to their large-scale management and utilization in fundamental science and applications. Noteworthy, structure-H (sH) gas hydrate lacks a comprehensive characterization of its structural, mechanical, and anisotropic properties. Anisotropic and pressure dependent properties are crucial for gas hydrates’ detection and recovery studies. The objective of this work is the determination of pressure-dependent elastic constants and mechanical properties and the direction-dependent moduli of sH gas hydrates as a function of guest composition. Firs

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